In a statement read out in court, Detective Sergeant Matthew Hollingsworth said that he went to the home and said there was “a strong smell of gas” coming from the first floor bedroom, which was underneath Dillan’s bedroom.

The householders were aware of the strong smell but thought it was down to the glue on the skirting boards that had been recently fitted.

A gas engineer later attended the home and confirmed there was a gas leak in the house but none of the children, including another three-month-old baby, were affected.

In the post mortem examination which was also read out, Pathologist Dr Srinivas Aannavarapu, said that the cause of death could have been down to the gas leak or sudden death syndrome but no gas, such as methane, was found in Dillan’s system.

Although there was no gas found in his system, Dr Aannavarapu added that the gas could have been “expelled” during CPR.